[IPV6]: Put addr_diff() into common header for future use.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 50 insertions, 52 deletions

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 65ec86678a08..98661fa4fc78 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -341,6 +341,54 @@ static inline int ipv6_addr_any(const struct in6_addr *a)
 }
 
 /*
+ * find the first different bit between two addresses
+ * length of address must be a multiple of 32bits
+ */
+static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
+{
+        const __u32 *a1 = token1, *a2 = token2;
+        int i;
+
+        addrlen >>= 2;
+
+        for (i = 0; i < addrlen; i++) {
+                __u32 xb = a1[i] ^ a2[i];
+                if (xb) {
+                        int j = 31;
+
+                        xb = ntohl(xb);
+                        while ((xb & (1 << j)) == 0)
+                                j--;
+
+                        return (i * 32 + 31 - j);
+                }
+        }
+
+        /*
+         *      we should *never* get to this point since that 
+         *      would mean the addrs are equal
+         *
+         *      However, we do get to it 8) And exacly, when
+         *      addresses are equal 8)
+         *
+         *      ip route add 1111::/128 via ...
+         *      ip route add 1111::/64 via ...
+         *      and we are here.
+         *
+         *      Ideally, this function should stop comparison
+         *      at prefix length. It does not, but it is still OK,
+         *      if returned value is greater than prefix length.
+         *                                      --ANK (980803)
+         */
+        return (addrlen << 5);
+}
+
+static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
+{
+        return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
+}
+
+/*
  *      Prototypes exported by ipv6
  */
 
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 4fcc5a7acf6e..1bf6d9a769e6 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -127,56 +127,6 @@ static __inline__ int addr_bit_set(void *token, int fn_bit)
         return htonl(1 << ((~fn_bit)&0x1F)) & addr[fn_bit>>5];
 }
 
-/*
- *      find the first different bit between two addresses
- *      length of address must be a multiple of 32bits
- */
-
-static __inline__ int addr_diff(void *token1, void *token2, int addrlen)
-{
-        __u32 *a1 = token1;
-        __u32 *a2 = token2;
-        int i;
-
-        addrlen >>= 2;
-
-        for (i = 0; i < addrlen; i++) {
-                __u32 xb;
-
-                xb = a1[i] ^ a2[i];
-
-                if (xb) {
-                        int j = 31;
-
-                        xb = ntohl(xb);
-
-                        while ((xb & (1 << j)) == 0)
-                                j--;
-
-                        return (i * 32 + 31 - j);
-                }
-        }
-
-        /*
-         *      we should *never* get to this point since that 
-         *      would mean the addrs are equal
-         *
-         *      However, we do get to it 8) And exacly, when
-         *      addresses are equal 8)
-         *
-         *      ip route add 1111::/128 via ...
-         *      ip route add 1111::/64 via ...
-         *      and we are here.
-         *
-         *      Ideally, this function should stop comparison
-         *      at prefix length. It does not, but it is still OK,
-         *      if returned value is greater than prefix length.
-         *                                      --ANK (980803)
-         */
-
-        return addrlen<<5;
-}
-
 static __inline__ struct fib6_node * node_alloc(void)
 {
         struct fib6_node *fn;
@@ -296,11 +246,11 @@ insert_above:
 
         /* find 1st bit in difference between the 2 addrs.
 
-           See comment in addr_diff: bit may be an invalid value,
+           See comment in __ipv6_addr_diff: bit may be an invalid value,
            but if it is >= plen, the value is ignored in any case.
          */
         
-        bit = addr_diff(addr, &key->addr, addrlen);
+        bit = __ipv6_addr_diff(addr, &key->addr, addrlen);
 
         /* 
          *              (intermediate)[in]